Postfix for CentOS5 with virtual users and domains

I have installed CentOS5 using the Perfect Setup Guide...
I need postfix with virtual users and domains and realy don't know how to install it. I have followed some guides but i nerver got it working... is there a guide similar to: http://www.howtoforge.com/fedora_virtual_postfix_mysql_quota_courier for CentOS5 or is there a way adding virtual user and domain support to the current version i have installed?

I have installed CentOS5 using the Perfect Setup Guide...
I need postfix with virtual users and domains and realy don't know how to install it. I have followed some guides but i nerver got it working... is there a guide similar to: http://www.howtoforge.com/fedora_virtual_postfix_mysql_quota_courier for CentOS5 or is there a way adding virtual user and domain support to the current version i have installed?

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I think that guide should work for CentOS as well (maybe with some very small modifications).